topographic name for someone who lived by a postern
gate, from Old French posterne; in some cases it would have
been a metonymic occupational name for a gatekeeper.
habitational name from Poston in Herefordshire or Poston in
Shropshire, which is named with an Old English personal name
Possa + þorn ‘thorn tree’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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